I really don't like Material Design and how it turned everything white-and-bright...it doesn't play 'nice' with AMOLED since darker schemes make it more power-efficient.
I don't like lockscreen notifications, and while I can turn them off, the Music Widget on the lockscreen is also gone, so if you disable those, you lose music controls on the lockscreen (plus, it seems Samsung screwed up and you don't get background album art on the lockscreen anymore).
Samsung also made the notification bar and notification texts really tiny. And you can't stop the pop-ups when you receive a notification (a-nnoy-ing).
New interruption system in LP, although bearable in Samsung's implementation (AKA: The Mute button), is really annoying.
The only thing that 'excites' me about Lollipop is Smart Lock.
So yea, 'Damn it!' is my initial response haha
Plus, just read all the horror stories from people getting their LP update for international Note 4's or the ones rolling out for the S5. NOT something I'm looking forward